Meaning: Having a relatively great height.
This sign is general but it cannot be applied to all objects and living things. There are more different signs (usually classifiers) for "tall" depending on what the nouns are.
For example, this sign cannot be used for "tall grass". Instead, use the (sometimes two-handed) classifier:4 for tall grasses.
Fun tidbit: We are about 1cm taller in the morning than in the evening, because during normal activities during the day, the cartilage in our knees and other areas slowly compress.
Gloss: TREE/\ IX1-CL:1 TREE/\ IX2 CL:1(ix2)-UP TRIPLE.
English equivalent: This tree is three times taller than that one.
The base hand also functions as a spatial reference to indicate the shorter one while the dominant hand moves up (taller).
Study how spatial reference in ASL works. In English, a speaker uses the determiners, "this" and "that" to indicate two different trees. In ASL, spatial indexing is used for determiners.